Antenna



March 28, 1939. R KOPANSK 2,152,316

ANTENNA Filed July 22, 1938 IN ENT R.

73 Rama 721 9007751! ATTORNEYS.

Patented Mar. 28, 1939 I PATENT OFFICE ANTENNA Roman Kopanski,Cleveland, Ohio, assignor to The Ward Products Corporation, Cleveland,

Ohio

Application July 22, 1938, Serial No. 220,791

Claims.

caused by the vibration from the movement and jarring of the automobile.

It is therefore the object of my invention to devise an antenna ofthetype mentioned with means for preventing such objectionable rattle.

More specifically, it is my object to devise an adjustable telescopingform of antenna with means for preventing rattle regardless of thposition to which it might be adjusted.

It is also the object of my.invention to devise a practical andeconomical means for preventing rattle in a telescopic form of antennaand, by the same means, to improve the radio reception.

Other objects will appear from the following description and claims whenconsidered together with the accompanying drawing.

Fig. 1 is an elevation of my improved antenna;

Fig. 2 is a view taken on line 2-2 of Fig. 1; and

Fig. 3 is a view taken on line 3--3 of Fig, 2.

It is to be understood that the present form of disclosure is merely forpurposes of illustration and that there may be devised variousmodifications therein without departing from the spirit of my inventionas herein set forth and claimed.

Referring to the accompanying drawing, the antenna comprises the outermetal tube I, the inner metal tube 2 and the metal rod 3, all of whichare arranged for telescopic adjustment.

The inner tube 2 is open at its inner end which is also bulged entirelythereabout, as indicated at 2 so as to provide uniform frictionalengagement with the wall of the outer tube I. The inner tube 2 is alsoprovided with the apertures 4 near the inner end thereof, for a purposeto be explained.

The rod 3 has its inner end portion bent so as to provide frictionalengagement at the two points 5 and 6 with the wall of the inner tube 2.

Except for the frictional engagement at the inner ends of the tube 2 andthe rod 3, as just 50 explained, these two members are otherwise spacedfrom each other and the inner tube 2 is otherwise spaced from the outertube I.

The upper end of the outer tube I is provided with the'screw-threadedpacking nut I and the packing or sealing washer 8, which eifect a sealedclosure for this end of the outer tube I and also a sealed connectionabout the inner tube 2 which is adapted to slide therethrough.

Likewise, the upper end of theinner tube 2 is provided with thescrew-threaded packing nut 3 and the packing or sealing washer Illthrough whichv the rod 3 extends in the same manner as just explained.

As indicated in the drawing, practically the entire internal space ofthe antenna is filled with a liquid of a certain character, as will beexplained. This liquid is applied through the open lower end of theouter tube I after the parts are all otherwise assembled and while ininverted fully telescoped position. When the lower end of the outer tubeis closed by the screw plug I2, and thus the liquid is sealed within theantenna.

The antenna, as above described, is supported in the holding means I3which may be attached to the automobile, with the necessary electricalconnection as usual.

The liquid II may be glycerine, castor oil, mineral oil, motor oil orother liquids of similar character, it being essential that the liquidbe capable of preventing clattering or rattling contact between theparts, as would otherwise result from vibration of the same set up byroughness of the road during motion of the automobile. Water, forinstance, does not possess this property and is therefore not suited forthis purpose, and the same thing is true of other liquids of likecharacter.

As will be seen, the liquid practically fills the space between thetubes I and 2 and the rod 3 when they are in telescoped position. Thenwhen tube 2 and rod 3 are extended to various positions, the liquid willstill practically fill the space between the tube 2 and the rod 3 aswell as the space between the tubes I and'2. If, for instance, the tube2 and rod 3 should be raised together and left to occupy such position,with the rod 3 in telescoped position within the tube 2, a continuousconcentric column of the liquid will still fill the space between thetube 2 and the rod 3, this column of liquid following with the tube 2and the rod 3., As well as can be judged, this is due to capillaryattraction or simply adhesion and cohesion.

Without excluding other theories in an attempt to explain how the liquidprevents rattle, this phenomenon is believed to be due to the pronouncedsurface or skin tension of the liquid. That is, the liquid possessessufficient shock resistance or film strength not to break down under thestrain of vibration of the parts; and thus there is prevented theobjectionable metal-tometal clatter or rattle.

The packing washers 8 and Ill serve not only to seal the liquid againstescape at these points, but the tube 2 and rod 3 are thereby kept freeof the liquid outside of the tube I. These washers serve also as anadditional means or preventing rattle at these points.

The opening at the inner end 01' the tube 2 and the apertures 4 permitpassage of the liquid so as to facilitate adjustment of the antenna.

Thus, when the antenna is in telescoped or collapsed position or when inpartially or fully extended position, the tubes i and 2 and the tube 2and rod 3 are always separated by the liquid so as to prevent clatteringbetween the parts, as would otherwise be caused by vibration.

As is quite evident, the medium adopted by me for preventing rattle isoi! a non-mechanical or non-metallic nature and there is nothing to getout of order. Furthermore, it is very inexpensive and can be applied ina very simple manner.

Incidentally, the presence of the liquid in the antenna will serve alsoas a means of clarifying the radio reception by eliminating foreignnoises and static.

The same invention as herein disclosed can be embodied also in otherdevices. as for instance in a telescopic fishing rod.

What I claim is:

1. A radio antenna comprising a hollow metallic tubular member, alongitudinally extensible metallic member mounted within said tubularmember, and a liquid oi comparatively high sur-- face tension withinsaid tubular member and substantially and continuously filling the spacebetween said members during all positions of the extensible member,whereby there will be prevented a rattling of the same in any adjustedposition. a

2. A radio antenna comprising a hollow metaltubular member, alongitudinally extensible hollow metallic tubular member mounted withinsaid first tubular member, a longitudinally aid justable metallic membermounted within said second tubular member, said members having means ofcontinuously free communication throughout the entire spacetherebetween, and a liquid 01. comparatively high surface tension withinsaid first tubular member and substantially filling the space betweensaid members, whereby there will be prevented a rattling of the same.

3. A radio antenna comprising a hollow metallic tubular member, alongitudinally extensible hollow metallic tubular member mounted withinsaid first tubular member, and having restricted contact with the innersurface thereof and being otherwise spaced therefrom, a longitudinallyadjustable metallic member mounted within said second tubular member andhaving restricted contact with the inner surface thereof and beingotherwise spaced therefrom, said members having means oi continuouslyfree communication throughout the entire space therebetween, and aliquid of comparatively high surface tension within said first tubularmember and substantially filling the space between said members, wherebythere will be prevented a rattling of the same.

4. In a device of the class described, the combination of longitudinallytelescopic metallic members, a liquid of comparatively high surfacetension substantially and continuously filling the space therebetweenduring all positions of the members, and means for sealing the liquidtherewithin, whereby there will be prevented a rattlinzg of the same,

5. A radio antenna comprising a hollow meta1- lic tubular member, asecond metallic member extensibly rnciuitetii Within said tubularmember, ase tension correto that of glycerine cub the spendingapproximate stantially and contii'iuously fillingble member, atherewithin, "w

